If you're going through 1/2 gallon every few weeks - you've got a leak. Since you smell it from the heater vents - it may very well be the heater core ($$$) that is leaking. Usually, you'll notice that the windows will fog up heavily as the coolant is very hot / steamy once the engine has warmed up fully.

Look for coolant puddles under the truck to get an idea as to where it is leaking from. If closer to the front bumper - it's probably not the heater core - if closer to the firewall - it could be the heater core.

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Don't know the exact amount but around 2-2 and a half gallon. Do this use one gallon straight antifreeze and one gallon water run engine for a few minutes then turn off. Check level and top off radiator. Add appropriate level to side tank

You might not see leaks if the fluid is leaking on the engine where it gets burnt off before dropping to the ground. That happened to me. Check all of the fluid levels. Engine oil, transmission oil, power steering oil and the antifreeze. Check when warm not hot, not cold. Pay special attention to the level and check once each day until you detect which is leaking.

this is a sign of a broken or punctured heater radiator which is located in the car cabinet that causes coolant to leak. you should also have noticed that the coolant level becomes low. you can either replace it or have it disconnected by removing the hoses that feed it with hot coolant, then you will have no heater inside the car cabinet.

heating core has been plumbed in wrong or most likely has a leak in the system, as you are smelling the antifreeze - seems to me like the antifreeze is not reaching the core, have you mistakenly plumbed the intake/out take the wrong way round?, this would cause the windows to fog up as the heat is being taken away fro the core rather than being taken into the heater core

First- When was the last time you checked it & it was full?Second- Is a lot missing (1/2 gallon)?Third- check the oil dipstick for any antifreeze in there or any white smoke from the exhaust,that would indicate a possible head gasket leak.Fourth- Do you smell antifreeze inside the truck? Look for a small leak under the glove box in the dashboard for the heater core.Hope this helps

It will need as much as it takes, which is impossible to tell depending on how you flushed it.But your whole system takes more than 2 gallons, and since you want a 50/50 mix you know you will need more than one gallon of antifreeze. So you need to start by purchasing 2 gallons. If you have left over, it does not go bad. And if you do not quite have enough, you can probably add a little extra water because you probably did not flush all the antifreeze out.Once you run it, then next time it will need more again after the heat bleeds the air out.